Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Left sided power meter and my Garmin 520 - L/R Balance issues

Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Left sided power meter and my Garmin 520 - L/R Balance issues

Old 05-29-19, 02:35 PM
  #1  
NoWhammies
Senior Member
Thread Starter
 
NoWhammies's Avatar
 
Join Date: Jul 2017
Location: Vancouver, BC
Posts: 825

Bikes: Argon 18 Gallium, BH G7

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 341 Post(s)
Liked 31 Times in 25 Posts
Left sided power meter and my Garmin 520 - L/R Balance issues

I have a Precision 4iiii power meter. Works great. No complaints.

I have the power meter interfaced with my Garmin 520. The 520 reads the watts output while I'm riding and when I view the ride after, I see my power output, average, etc.

But when it comes to the screen showing L/R balance, I am seeing this:



This doesn't make sense to me because:
  • The power meter is on the left side of my bike
  • I thought single sided power meters compensated for being only on one crank arm.
Am I missing something here? Anyone have any insight? Thank you.
NoWhammies is offline  
Old 05-29-19, 03:38 PM
  #2  
rubiksoval
Senior Member
 
Join Date: Nov 2015
Location: Music City, USA
Posts: 2,910

Bikes: Felt AR

Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 1691 Post(s)
Liked 70 Times in 42 Posts
If by compensate you mean double the measured output, yes.

No idea why it's attributing power to the wrong side, though. Interesting!
rubiksoval is offline  
Likes For rubiksoval:
Old 05-29-19, 05:54 PM
  #3  
seau grateau
Senior Member
 
seau grateau's Avatar
 
Join Date: Sep 2009
Location: PHL
Posts: 9,608

Bikes: Litespeed, IRO

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 1172 Post(s)
Liked 96 Times in 50 Posts
Maybe it's British?
seau grateau is offline  
Old 05-30-19, 12:31 PM
  #4  
TrojanHorse
SuperGimp
 
TrojanHorse's Avatar
 
Join Date: Mar 2010
Location: Whittier, CA
Posts: 13,145

Bikes: Specialized Roubaix

Mentioned: 135 Post(s)
Tagged: 0 Thread(s)
Quoted: 1012 Post(s)
Liked 23 Times in 18 Posts
Who cares? Looking at balance with a 1 sided power meter is useless anyway.
TrojanHorse is offline  
Old 05-30-19, 02:05 PM
  #5  
NoWhammies
Senior Member
Thread Starter
 
NoWhammies's Avatar
 
Join Date: Jul 2017
Location: Vancouver, BC
Posts: 825

Bikes: Argon 18 Gallium, BH G7

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 341 Post(s)
Liked 31 Times in 25 Posts
I care I want to make sure everything is working properly.
NoWhammies is offline  
Old 05-31-19, 02:27 PM
  #6  
WhyFi
Senior Member
 
WhyFi's Avatar
 
Join Date: Jan 2010
Location: Got a castle in - er, Minneapolis, that's where I dwell!
Posts: 24,865

Bikes: 2016 Diamondback Haanjo, 2018 Trek Domane SL5 Gravel

Mentioned: 298 Post(s)
Tagged: 1 Thread(s)
Quoted: 8900 Post(s)
Liked 141 Times in 85 Posts
I don't see a reason to be concerned about it, but have you poked through the 4iiii app?
WhyFi is offline  
Old 05-31-19, 02:35 PM
  #7  
gregf83 
Senior Member
 
Join Date: Jun 2008
Location: Vancouver, BC
Posts: 8,753
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 897 Post(s)
Liked 22 Times in 16 Posts
Originally Posted by NoWhammies View Post
I care I want to make sure everything is working properly.
The L/R data you see is not applicable and won't tell you whether the power meter is working properly. Best way to test is to borrow a powertap from someone and an extra head unit and compare the data you get from both powermeters. Everything else relies on faith and guesswork.

Last edited by gregf83; 05-31-19 at 11:45 PM.
gregf83 is offline  
Old 05-31-19, 03:52 PM
  #8  
NoWhammies
Senior Member
Thread Starter
 
NoWhammies's Avatar
 
Join Date: Jul 2017
Location: Vancouver, BC
Posts: 825

Bikes: Argon 18 Gallium, BH G7

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 341 Post(s)
Liked 31 Times in 25 Posts
@WhyFi Yeah, I have a phone call in to 4iiii to see what they can tell me.

@gregf83 Agreed. But like I said if the power meter is reporting power coming from the right leg, and the crank is on the left, something is likely wrong. As I have approx 6mos left of warranty, I want to make sure the unit is functioning as it should.
NoWhammies is offline  
Old 06-03-19, 12:05 PM
  #9  
NoWhammies
Senior Member
Thread Starter
 
NoWhammies's Avatar
 
Join Date: Jul 2017
Location: Vancouver, BC
Posts: 825

Bikes: Argon 18 Gallium, BH G7

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 341 Post(s)
Liked 31 Times in 25 Posts
Quick update.

I called 4iiii and they tell me that others are having the same issue. Seems the most recent software update is the cause. The PM still function as it should though, so no worries there. According to 4iiii they are working on a fix.
NoWhammies is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
geezerwheels
Bicycle Mechanics
27
01-26-18 09:18 AM
SlinkyWizard
Hybrid Bicycles
2
06-07-16 11:23 AM
FastJake
Commuting
47
04-22-12 05:54 PM
rustycycler
Bicycle Mechanics
5
08-04-10 10:14 AM
CaptDon
Bicycle Mechanics
0
05-03-07 09:26 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.